A parachutist has a mass of 90 kg and a projected frontal area of 0.30 m 2 in free fall. The drag coefficient based on frontal area is found to be 0.75. if the air density is 1.28 kg/m 3 , the terminal velocity of the parachutist will be
(a) 104.4 m/s (b) 78.3 m/s
(c) 25 m/s (d) 18.5 m/s